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SEDIMENT-HOSTED AU DEPOSITS (MODEL 26A; Berger, 1986) By
SEDIMENT-HOSTED AU DEPOSITS (MODEL 26a; Berger, 1986) by Albert H. Hofstra, Joel S. Leventhal, David J. Grimes, and William D. Heran SUMMARY OF RELEVANT GEOLOGIC, GEOENVIRONMENTAL, AND GEOPHYSICAL INFORMATION Carlin-type deposits are epigenetic, large-tonnage, low-grade, sediment-hosted disseminated gold deposits. The deposits are known mainly in northern Nevada and northwestern Utah where they are arranged in clusters and belts. The deposits in this region are estimated to contain about 5,000 tonnes of gold, more than half of which (~3100 tonnes) is in the Carlin Trend. Approximately 1,000 tonnes of gold have been produced. Carlin-type gold deposits are one of the most important types currently being mined in the western United States. Many aspects of this geoenvironmental model also apply to distal disseminated deposits as defined by Cox and Singer (1990), Doebrich and Theodore (in press), and Howe and others (1995). Deposit geology Unoxidized refractory ore: Refractory ore consists of variably decalcified, dedolomitized, argillized, silicified, sulfidized, carbonaceous sedimentary rocks that contain disseminated iron, arsenic, antimony, mercury, and thallium sulfide minerals. Base-metal sulfide minerals are rare or absent in most deposits. Although pyrite, marcasite, orpiment, and realgar have high acid-generating capacity, they generally are present in small amounts (much less than 5 volume percent) and are usually disseminated in, or surrounded by, carbonate rocks with high acid-consuming capacity. Zones with 5-50 volume percent pyrite, marcasite, orpiment, or realgar are present in some deposits. Ore is refractory because much of the gold forms sub-micron grains in pyrite and marcasite and because carbon in the rock can extract gold from cyanide solutions. -
Overview of Tanzania's Mining Operations
Public Disclosure Authorized SESA of the Tanzanian Sustainable Management of Mineral Resources Project Final Report May 2013 Public Disclosure Authorized Public Disclosure Authorized Public Disclosure Authorized Prepared by LUC in association with GEUS & Matrix Development Consultants Project Title: SESA of the Tanzanian Sustainable Management of Mineral Resources Project Client: Ministry of Energy and Minerals, Government of Tanzania Version Date Version Details Prepared by Checked by Approved by Principal 1 21/12/12 Draft Final Report LT, PN, SW, JT LT PN 2 02/05/13 Final Report LT, PN, SW, JT LT, NJ PN, NJ SESA of the Tanzanian Sustainable Management of Mineral Resources Project Final Report Prepared by LUC in association with GEUS & Matrix Development Consultants May 2013 Planning & EIA LUC BRISTOL Offices also in: Land Use Consultants Ltd Registered in England Design 14 Great George Street London Registered number: 2549296 Landscape Planning Bristol BS1 5RH Glasgow Registered Office: Landscape Management Tel:0117 929 1997 Edinburgh 43 Chalton Street Ecology Fax:0117 929 1998 London NW1 1JD Mapping & Visualisation [email protected] FS 566056 LUC uses 100% recycled paper EMS 566057 Contents 1 Introduction 3 Introduction to the Minerals Sector 3 The Sustainable Management of Mineral Resources Project 5 Purpose of the Report 5 2 The SESA Process 7 The Role of SESA 7 Methodology Used 8 3 Background to the Minerals Sector 11 Overview of Tanzania’s Mineral Resource 11 Overview of Tanzania’s Mining Operations 12 Background Context to -
Acacia Mining: Human Rights Violations and the Company’S Grievance Mechanism in North Mara, Tanzania
Questions & Answers Acacia Mining: Human rights violations and the company’s grievance mechanism in North Mara, Tanzania Click on the question to jump to the answer. 1. What is an operational-level grievance mechanism? 2. Why are they important? 3. What do grievance mechanisms have to do with human rights? 4. Why do businesses like company-based grievance mechanisms? 5. Do companies themselves investigate and decide grievances? 6. Who is Acacia Mining and where is its North Mara Gold Mine? 7. How is Acacia Mining linked to Barrick Gold? 8. What are the human rights problems at North Mara mine? 9. Who are these ‘intruders’ who come into the mine? 10. How does the Mine deal with ‘intruders’? 11. Is it necessary to use force against the ‘intruders’? 12. Is the company’s private security also involved in violations? 13. Does Acacia Mining have similar problems at its other mine sites? 14. Why does Acacia use the Tanzanian police to provide security? 15. Intruders have decreased so aren’t violations only a historical problem? 16. Are ‘intruders’ still being killed at North Mara mine? 17. Does Acacia report on how many ‘intruders’ are injured? 18. Has Acacia been questioned about its reporting on deaths/injuries? 19. Is Acacia right to say that RAID has made 'sweeping claims' and misrepresented the human rights situation? 20. If the Tanzanian police are shooting people, why is this the company’s responsibility? 21. How many police officers have been charged with criminal offences? 22. Has Acacia raised the issue of police violations with government officials? 23. -
Technical Report Getchell Project NI 43-101 Technical Report Premier Gold Mines Limited and I-80 Gold Corp
AMC Mining Consultants (Canada) Ltd. BC0767129 200 Granville Street, Suite 202 Vancouver BC V6C 1S4 Canada T +1 604 669 0044 E [email protected] W amcconsultants.com Technical Report Getchell Project NI 43-101 Technical Report Premier Gold Mines Limited and i-80 Gold Corp Humboldt County, Nevada, USA In accordance with the requirements of National Instrument 43-101 “Standards of Disclosure for Mineral Projects” of the Canadian Securities Administrators Qualified Persons: D Nussipakynova, P.Geo. P Greenhill, FAusIMM (CP) AMC Project 720031 Effective date 23 July 2020 Report date 22 January 2021 Unearth a smarter way Getchell Project NI 43-101 Technical Report Premier Gold Mines Limited and i-80 Gold Corp 720031 1 Summary 1.1 Introduction This Technical Report (the Report) provides an update of the Mineral Resource estimates and metallurgy of the Mineral Resources identified within the Getchell Project (Property) located in Humboldt County, Nevada, USA. The Report has been prepared by AMC Mining Consultants (Canada) Ltd. (AMC) of Vancouver, Canada on behalf of Premier Gold Mines Limited / i-80 Gold Corp (i-80 or the Companies). On 10 August 2020, Premier entered into a definitive purchase agreement with affiliates of Waterton Global Resource Management, Inc. to acquire from Waterton all of the outstanding membership interests of Osgood Mining Company LLC (OMC). The Property comprises a number of property parcels which collectively encompass 2,545 acres in the Potosi mining district. The four-square miles of land contain all areas of past gold production and the area of the currently estimated Mineral Resource. This area includes the historical Pinson Mine. -
De Gouvernance À
UNIVERSITÉ DU QUÉBEC À MONTRÉAL DE GOUVERNANCE À RSE: LE GRI EST-IL UN OUTIL DE REDDITION DE COMPTES EFFICACE POUR L'IMPACT SUR LES ENJEUX DU DÉVELOPPEMENT DURABLE DES PRINCIPALES MINIÈRES CANADIENNES À L'ÉTRANGER? MÉMOIRE PRÉSENTÉ COMME EXIGENCE PARTIELLE DE LA MAÎTRISE ÈS SCIENCES DE LA GESTION PAR DAISY TIBURCIO CARNEIRO OCTOBRE 2018 UNIVERSITÉ DU QUÉBEC À MONTRÉAL Service des bibliothèques Avertissement La diffusion de ce mémoire se fait dans le respect des droits de son auteur, qui a signé le formulaire Autorisation de reproduire et de diffuser un travail de recherche de cycles supérieurs (SDU-522 – Rév.07-2011). Cette autorisation stipule que «conformément à l’article 11 du Règlement no 8 des études de cycles supérieurs, [l’auteur] concède à l’Université du Québec à Montréal une licence non exclusive d’utilisation et de publication de la totalité ou d’une partie importante de [son] travail de recherche pour des fins pédagogiques et non commerciales. Plus précisément, [l’auteur] autorise l’Université du Québec à Montréal à reproduire, diffuser, prêter, distribuer ou vendre des copies de [son] travail de recherche à des fins non commerciales sur quelque support que ce soit, y compris l’Internet. Cette licence et cette autorisation n’entraînent pas une renonciation de [la] part [de l’auteur] à [ses] droits moraux ni à [ses] droits de propriété intellectuelle. Sauf entente contraire, [l’auteur] conserve la liberté de diffuser et de commercialiser ou non ce travail dont [il] possède un exemplaire.» REMERCIEMENTS L'exercice d'un mémoire est certainement un défi qui nous tire hors de notre zone de confort. -
Tanzania-BHR Mission North Mara
The International Commission of Jurists concludes visit to North Mara mine in Tanzania On Friday 1 September, a delegation from the International Commission of Jurists (ICJ) concluded a learning and assessment mission to the North Mara region and the North Mara Gold Mine Ltd, a subsidiary of Acacia Mining plc located in north-west Tanzania in the Tarime district of the Mara region. The visit took place between 27 August and 1 September. The objective of the ICJ Mission was to learn about the operation with a view to assessing the effectiveness of the North Mara Gold Mine’s operational grievance mechanism (OGM) in addressing complaints over alleged human rights concerns and abuses committed in connection with the mine’s operations. The mission noted the progress that the mine has made in developing its OGM and will be continuing to gather information with a view to more fully understanding its operation. The North Mara mine is by far the largest investment and economic engine for the region, and a major attraction for people migrating into the immediate area, whose population has grown exponentially since the mine was initiated in 1998. The prospect of gold predictably created a strong economic magnet that was bound to attract people in search of economic opportunities. As company officials themselves acknowledged, the company was slow in putting in place the necessary physical security and measures to avoid human rights abuses and to redress those which occurred. The delegation is grateful to the NGO Legal and Human Rights Centre (LHRC) of Tanzania for its facilitation of the visit and especially the meetings with a number of people who have grievances pending against the company. -
Net Income Rises 29% to $514 Million ($0.59 Per Share) Expanded Margins Increase Profitability in Q1
FIRST QUARTER REPORT - MAY 6, 2008 For a full explanation of results, the Financial Statements and Management Discussion & Analysis, Based on US GAAP and expressed in US dollars full-year guidance at significant mines, and mine statistics, please see the Company’s website, www.barrick.com. Net Income Rises 29% to $514 Million ($0.59 per share) Expanded Margins Increase Profitability in Q1 Highlights • The Company reported first quarter net income of $514 million ($0.59 per share) and operating cash flow of $728 million ($0.83 per share) compared to a net loss of $159 million ($0.18 per share) and operating cash flow of $163 million ($0.19 per share) in the prior year period. Reported net income rose 29% compared to prior year adjusted net income of $398 million ($0.46 per share)1 and included $29 million of post-tax special items that reduced income by $0.03 per share. Adjusting for these special items, earnings of $0.62 per share are a Company record. The realized gold price of $925 per ounce matched the average spot price for the quarter. • First quarter gold production was 1.74 million ounces at total cash costs of $393 per ounce2, and copper production was 87 million pounds at total cash costs of $0.94 per pound2. The Company maintains full year production guidance of 7.6 - 8.1 million ounces of gold at total cash costs of $390 - $415 per ounce and 380 - 400 million pounds of copper at total cash costs of $1.15 - $1.25 per pound. -
Annual Information Form for the Year Ended December 31, 2018 Dated As of March 22, 2019 BARRICK GOLD CORPORATION
Barrick Gold Corporation Brookfield Place, TD Canada Trust Tower Suite 3700, 161 Bay Street, P.O. Box 212 Toronto, ON M5J 2S1 Annual Information Form For the year ended December 31, 2018 Dated as of March 22, 2019 BARRICK GOLD CORPORATION ANNUAL INFORMATION FORM TABLE OF CONTENTS GLOSSARY OF TECHNICAL AND BUSINESS TERMS 4 REPORTING CURRENCY, FINANCIAL AND RESERVE INFORMATION 10 FORWARD-LOOKING INFORMATION 11 SCIENTIFIC AND TECHNICAL INFORMATION 14 THIRD PARTY DATA 15 GENERAL INFORMATION 15 Organizational Structure 15 Subsidiaries 16 Areas of Interest 18 General Development of the Business 18 History 18 Significant Acquisitions 18 Strategy 19 Recent Developments 21 Results of Operations in 2018 22 NARRATIVE DESCRIPTION OF THE BUSINESS 26 Production and Guidance 26 Reportable Operating Segments 26 Barrick Nevada 27 Pueblo Viejo (60% basis) 28 Lagunas Norte 29 Veladero (50% basis) 29 Turquoise Ridge (75% basis) 30 Acacia Mining plc (63.9% basis) 31 Pascua-Lama Project 32 Mineral Reserves and Mineral Resources 33 Marketing and Distribution 46 Employees and Labor Relations 47 Competition 48 Sustainability 48 Operations in Emerging Markets: Corporate Governance and Internal Controls 49 Board and Management Experience and Oversight 50 Communications 51 - i - Internal Controls and Cash Management Practices 51 Managing Cultural Differences 52 Books and Records 52 MATERIAL PROPERTIES 52 Cortez Property 52 Goldstrike Property 58 Turquoise Ridge Mine 63 Pueblo Viejo Mine 69 Veladero Mine 76 Kibali Mine 86 Loulo-Gounkoto Mine Complex 93 EXPLORATION -
Golden Rules Making the Case for Responsible Mining
GOLDEN RULES Making the case for responsible mining A REPORT BY EARTHWORKS AND OXFAM AMERICA Contents Introduction: The Golden Rules 2 Grasberg Mine, Indonesia 5 Yanacocha Mine, Peru, and Cortez Mine, Nevada 7 BHP Billiton Iron Ore Mines, Australia 9 Hemlo Camp Mines, Canada 10 Mongbwalu Mine, the Democratic Republic of Congo 13 Rosia Montana Mine, Romania 15 Marcopper Mine, the Philippines, and Minahasa Raya and Batu Hijau Mines, Indonesia 17 Porgera Gold Mine, Papua New Guinea 18 Junín Mine, Ecuador 21 Akyem Mine, Ghana 22 Pebble Mine, Alaska 23 Zortman-Landusky Mine, Montana 25 Bogoso/Prestea Mine, Ghana 26 Jerritt Canyon Mine, Nevada 27 Summitville Mine, Colorado 29 Following the rules: An agenda for action 30 Notes 31 Cover: Sadiola Gold Mine, Mali | Brett Eloff/Oxfam America Copyright © EARTHWORKS, Oxfam America, 2007. Reproduction is permitted for educational or noncommercial purposes, provided credit is given to EARTHWORKS and Oxfam America. Around the world, large-scale metals mining takes an enormous toll on the health of the environment and communities. Gold mining, in particular, is one of the dirtiest industries in the world. Massive open-pit mines, some measuring as much as two miles (3.2 kilometers) across, generate staggering quantities of waste—an average of 76 tons for every ounce of gold.1 In the US, metals mining is the leading contributor of toxic emissions to the environment.2 And in countries such as Ghana, Romania, and the Philippines, mining has also been associated with human rights violations, the displacement of people from their homes, and the disruption of traditional livelihoods. -
The Porgera Mine – Papua New Guinea
To the Ministry of Finance Recommendation of 14 August 2008 Contents 1 Introduction 1 2 Sources 2 3 The Council’s considerations 3 4 Accusations of severe environmental damage and other factors 4 5 The Porgera mine – Papua New Guinea 6 5.1 Background 6 5.2 Riverine tailings disposal 8 5.2.1 Sediment load 8 5.2.2 Discharge of heavy metals 11 5.3 Environmental effects on the flood plain and Lake Murray 13 5.3.1 Mercury pollution 16 5.3.2 Health and social effects associated with the tailings disposal 18 6 Barrick’s response to the Council 20 7 The Council’s assessment 22 8 Conclusion 25 9 Recommendation 25 1 Introduction At a meeting held on 4 October 2005, the Council on Ethics for the Government Pension Fund – Global decided to assess whether investments in the company then known as Placer Dome, currently Barrick Gold Corporation, would imply a risk of the Fund contributing to severe environmental damage under the Ethical Guidelines, point 4.4. As of 31 December 2007 the Government Pension Fund – Global held shares worth some NOK 1,274 million in the company. Barrick Gold is a Canadian mining company, which, in several countries, has been accused of causing extensive environmental degradation. The Council has investigated whether riverine tailings disposal from the Porgera mine in Papua New Guinea generates severe environmental damage, and finds it established that the mining operation at Porgera entails considerable pollution. The Council attributes particular importance to the heavy metals contamination, especially from mercury, produced by the tailings. -
Annual Reportannual 2016 Barrick Goldbarrick Corporation of Owners Of
Barrick Gold Corporation Annual Report 2016 Barrick Gold Corporation A Company of Owners Annual Report 2016 Our Vision is the generation of wealth through responsible mining – wealth for our owners, our people, and the countries and communities with which we partner. We aim to be the leading mining company focused on gold, growing our cash flow per share by developing and operating high-quality assets through disciplined allocation of human and financial capital and operational excellence. “ In 2016, we further strengthened our balance sheet and generated record free cash flow through a disciplined and rigorous approach to capital allocation. Going forward, digital technology and innovation will play an increasingly important role across our business as we seek to grow the long-term value of our portfolio with a focus on growing margins and returns over production volume.”Kelvin Dushnisky, President Our Assets are located in geopolitically stable regions with an increasing focus on our five core mines in the Americas. Proven and Probable Mineral Reserves6 As at Production Cost of Sales AISC1† Tonnes Grade Contained Golden Sunlight Hemlo December 31, 2016 (000s ozs) ($/oz) ($/oz) (000s ozs) (gm/t) (000s ozs) Turquoise Ridge JV Goldstrike 20% Cortez Goldstrike 1,096 852 714 70,685 3.55 8,077 19% ~70% of 2016 production Cortez 1,059 901 518 151,002 2.11 10,220 Pueblo Viejo 13% from core mines at Cost of Sales$793/oz Pueblo Viejo (60%) 700 564 490 85,821 2.93 8,087 1 8% and AISC $606/oz Lagunas Norte Lagunas Norte 435 651 529 70,670 1.86 4,218 Other Gold Mines: Porgera JV, Papua New Guinea Veladero 544 872 769 252,125 0.83 6,749 Kalgoorlie JV, Australia Acacia, Tanzania Other Copper Mines: Core mines sub-total 3,834 793 606 631,283 1.85 37,473 Zaldívar Copper JV 10% Jabal Sayid JV, Saudi Arabia Veladero Lumwana, Zambia Total Barrick 5,517 798 730 2,006,898 1.33 85,950 †Please see page 84 of the 2016 Financial Report for corresponding endnotes. -
Annual Report
Annual Report 2003/04 www.doir.wa.gov.au Department of Industry and Resources Annual Report 2003/04 ISSN 1448-7756 Department of Industry and Resources Annual Report 2003/04 The Director-General’s Report____________________________________________________1 DoIR at a Glance_______________________________________________________________3 Relevant Legislation_________________________________________________________________________ 3 Enabling Legislation and Formation Date _______________________________________________________ 3 Legislation which the Department Administers ___________________________________________________ 3 Legislation which Impacts upon the Department __________________________________________________ 3 Responsible Minister_________________________________________________________________________ 3 Our Vision _________________________________________________________________________________ 3 Our Mission ________________________________________________________________________________ 3 Our Responsibility___________________________________________________________________________ 3 DoIR Core Values ___________________________________________________________________________ 3 The DoIR Structural Groups __________________________________________________________________ 4 The Groups’ Functions _______________________________________________________________________ 4 The Department’s High-Level Outputs__________________________________________________________ 4 Organisational Structure and Senior Officers as at 30/6/04 _________________________________________